[openwrt/openwrt] ath79: add missing MTD_NAND_RB91X symbol

[LEDE Commits]

xback pushed a commit to openwrt/openwrt.git, branch openwrt-21.02:
https://git.openwrt.org/febf6db0d02c1bdadd4db621a0070b80eb94b7fb

commit febf6db0d02c1bdadd4db621a0070b80eb94b7fb
Author: Koen Vandeputte <koen.vandeputte at ncentric.com>
AuthorDate: Fri Jul 9 13:50:57 2021 +0200

    ath79: add missing MTD_NAND_RB91X symbol
    
    Looks like the symbol was forgotten for 5.4
    
    Fixes: 820e660cd7 ("ath79: add NAND driver for MikroTik RB91xG series")
    Signed-off-by: Koen Vandeputte <koen.vandeputte at ncentric.com>
    (cherry picked from commit 52c27dab1973d523453fc1e319d8636e1cb10927)
---
 target/linux/ath79/config-5.4 | 1 +
 1 file changed, 1 insertion(+)

diff --git a/target/linux/ath79/config-5.4 b/target/linux/ath79/config-5.4
index 4760e55b62..60f57692e2 100644
--- a/target/linux/ath79/config-5.4
+++ b/target/linux/ath79/config-5.4
@@ -173,6 +173,7 @@ CONFIG_MTD_CFI_GEOMETRY=y
 CONFIG_MTD_CMDLINE_PARTS=y
 # CONFIG_MTD_MAP_BANK_WIDTH_1 is not set
 # CONFIG_MTD_MAP_BANK_WIDTH_4 is not set
+# CONFIG_MTD_NAND_RB91X is not set
 CONFIG_MTD_PARSER_CYBERTAN=y
 CONFIG_MTD_PHYSMAP=y
 CONFIG_MTD_SPI_NOR=y